Research by DoINeedAPermit Research Team · Updated May 2026
The Short Answer
New heat pump installations, conversions from gas furnace, and supplemental heat-pump additions all require a permit from the City of SeaTac Building Department. Like-for-like replacements of existing heat pumps at the same location and tonnage may be exempt if pulled by a licensed contractor, but the safest path is to file.
SeaTac sits in the Puget Sound maritime climate (4C west of the Cascades) and has adopted the 2021 Washington State Building Code, which includes the IRC and Washington-specific amendments on heat-pump installation. Unlike some neighboring jurisdictions (e.g., Kent, Tukwila), SeaTac does NOT have an explicit owner-builder exemption for heat-pump work — you must be a licensed HVAC contractor (trade license) or hire one. The city's building department processes permits online through their portal and typically issues over-the-counter approvals for straightforward replacements pulled by licensed contractors within 1-2 weeks. New installations, however, require manual J load calculations (to verify the unit is sized correctly for the home's climate zone and insulation) and electrical panel review — Seattle City Light's interconnection rules also apply if the heat pump will interact with any smart grid or demand-response program. The real city-specific wrinkle: SeaTac's proximity to Puget Sound means high moisture and mild winters, which shifts the heating-load equation compared to east-of-the-Cascades jurisdictions (e.g., Spokane); a system sized for SeaTac's 12-inch frost depth and rain-heavy climate will differ from one in a 30+ inch frost zone. State of Washington also incentivizes heat pumps through utility rebates (often $2,000–$5,000 via Puget Sound Energy or other local utilities), but rebates are only available on PERMITTED and inspected installations.

What happens if you skip the permit (and you needed one)

SeaTac heat pump permits — the key details

SeaTac Building Department enforces the 2021 Washington State Building Code, which incorporates the 2021 International Residential Code (IRC) and the International Energy Conservation Code (IECC). Heat pump installations fall under IRC M1305 (mechanical systems) and the National Electrical Code (NEC 440, condensing unit clearances and electrical protection). The critical first step is determining whether your project is a replacement, conversion, or new addition. A replacement means the new heat pump goes in the exact same location (indoor and outdoor units), uses the same refrigerant line routing, connects to the existing ductwork or indoor coil, and is the same or smaller tonnage. Conversions — swapping a gas furnace for a heat pump — and new installations (adding a heat pump to a home with only baseboard or radiant heat) always require a permit. The city's Building Department reviews applications through their online portal; simple replacements pulled by a licensed HVAC contractor may receive over-the-counter approval (issued same day or next business day), while new installs and conversions typically require plan review and site inspection. Washington State law (RCW 19.28) mandates that HVAC work be performed by a contractor holding a current HVAC license; owner-builder exemptions do not apply to heat pump systems. Even if you own the home outright, you cannot legally install your own heat pump in SeaTac.

Sizing and load calculations are non-negotiable in SeaTac's maritime climate. The city (and state energy code) requires a Manual J load calculation for any new or replacement heat pump that differs in capacity from the existing system. Manual J accounts for the home's insulation, air leakage, square footage, and local climate data (including Puget Sound's high humidity and mild winters, which reduce heating load compared to interior Washington). An undersized heat pump will cycle constantly and draw down your savings; an oversized unit wastes energy and money. The load calc must be submitted with the permit application or referenced on the electrical/mechanical plan. Backup heat is also critical: most heat pumps include electric resistance heating (strip heat) that activates when outdoor temps drop below the heat pump's balance point (typically 15–35°F, depending on the unit). SeaTac's winters rarely hit zero, but cold snaps do occur, and the backup heat must be wired, sized, and shown on the electrical plan. The building inspector will verify that the auxiliary breaker in your service panel has capacity; if your panel is full, you may need an upgrade (add $2,000–$4,000 to the project cost).

Refrigerant line routing and condensate drainage are common failure points in Seattle's wet climate. IRC M1305.4 requires that refrigerant lines be insulated and protected from physical damage; outdoor lines must slope toward the outdoor unit to prevent oil trapping. In SeaTac's rain-heavy climate, condensate from the indoor coil (during cooling and dehumidification) must drain to a proper trap or sump — the building inspector will demand photos or site verification that the drain line slopes correctly and does not back up into the home. Many old homes in SeaTac have been retrofitted with heat pumps in crawlspaces or attics where moisture is already a problem; the inspector will flag inadequate drainage or mold risks. Refrigerant charge and line length must also comply with the heat pump manufacturer's specs (usually printed on the outdoor unit's nameplate); exceeding the maximum line length (e.g., 50 feet for some units) voids the warranty and can cause compressor failure. The HVAC contractor should provide a certificate of charge, line-length calculation, and pressure test results as part of the permit closeout. SeaTac's Building Department will not issue a final sign-off without these documents.

Electrical work and service-panel integration are governed by the 2023 National Electrical Code (adopted by Washington State) and NEC Article 440 (motor compressor applications). The heat pump's outdoor condenser unit draws significant startup current; NEC 440.22 requires a dedicated breaker sized at 125% of the compressor's rated-load current (often 20–60 amps for residential units). If your existing 100-amp or 150-amp service panel does not have a spare double-pole breaker, you will need a sub-panel or panel upgrade. The Building Department requires a licensed electrician to pull a separate electrical permit for the heat pump circuit; this is not a DIY item. SeaTac's permit fee for the electrical portion is typically $75–$150 (based on project valuation), and the electrical inspector will verify breaker sizing, wire gauge, grounding, and disconnect switch placement. Many homeowners discover during the permit process that their panel needs upgrading; this can add 4–6 weeks to the timeline and $2,000–$5,000 to the budget. The HVAC and electrical permits can be pulled together and inspected in sequence, so plan for 3–4 inspection visits over 2–4 weeks.

State and utility incentives make the permit investment worthwhile. Washington State offers a 30% federal IRA tax credit (up to $2,000) for heat pump installations on owner-occupied homes; Puget Sound Energy and other local utilities offer rebates of $1,500–$5,000 depending on the unit's SEER rating (Seasonal Energy Efficiency Ratio) and whether it qualifies as ENERGY STAR Most Efficient. All rebate programs require a completed, permitted, and inspected installation; unpermitted work disqualifies you from every cent. The permit application should note if you intend to claim rebates, so the inspector knows to verify SEER and HSPF ratings. SeaTac's Building Department typically closes a permit within 2 weeks of final inspection if everything is in order. The contractor should handle scheduling inspections and pulling final approval; if you hire a licensed HVAC and electrical firm, they will navigate the permitting process as part of their scope.

Three SeaTac heat pump installation scenarios

Scenario A
Like-for-like heat pump replacement, single-zone split system, existing location, licensed contractor — SeaTac bungalow
A homeowner in north SeaTac has a failing 3-ton Fujitsu ASHP12RLS1 mini-split heat pump installed in 2015 (outdoor unit on the side wall, indoor head in the living room). The unit is still in the same location and capacity. A licensed HVAC contractor (Washington State license current) quotes $5,800 for a new Fujitsu 3-ton unit, installation, and testing. The contractor pulls the permit application online and submits it with the equipment specs and a photo of the existing location; no Manual J load calc is required because the tonnage and location are identical. The Building Department issues the permit over-the-counter within 1 business day (no fee or $25 filing fee, depending on whether the city charges for a simple replacement). The contractor schedules one inspection (rough-in, to verify refrigerant lines and electrical) and completes the job within 2 days. Final inspection happens within 1 week, with the inspector checking refrigerant charge, electrical breaker sizing, and condensate drain routing. If everything is compliant, the permit closes and the homeowner can claim the 30% federal IRA tax credit ($1,740 max) on next year's tax return. Puget Sound Energy also offers a $2,000 rebate for SEER ≥16 units; the rebate requires proof of the closed permit. Total timeline: 2–3 weeks. Total permit cost: $0–$50. Total project cost: $5,800 (contractor labor + materials). Note: If the homeowner had chosen a larger unit (e.g., 3.5 tons) or moved the outdoor location to the back yard, a full permit with Manual J calc would be required, adding 2–3 weeks and $150–$300 in fees.
Like-for-like replacement | Licensed contractor required | $0–$50 permit fee | Rough + final inspection (1–2 weeks) | 30% IRA credit eligible | Rebates $1,500–$2,000 PSE | Total project $5,500–$7,000
Scenario B
Gas furnace to heat pump conversion, new ductwork routing, Manual J required — SeaTac mid-century rambler
A homeowner east of the SeaTac airport replaces a 50-year-old gas furnace (95% AFUE) and central AC with a new air-source heat pump system. The home is 1,500 sq ft, insulation is modest (R-13 walls, R-19 attic), and the existing ductwork is original asbestos-lined flex duct that must be replaced. The contractor proposes a 4-ton heat pump with a new sheet-metal duct system routed through the attic, a 40-amp breaker for the outdoor unit, and a 10-kW electric resistance strip for backup heat. Because the tonnage differs from the existing AC (old unit was 3 tons), a Manual J load calculation is mandatory; the contractor uses a software tool (ACCA-certified) that inputs the home's dimensions, insulation values, air-leakage test (blower door), and SeaTac's winter design temp (28°F) and summer temp (79°F, per ASHRAE). The Manual J shows the 4-ton unit is appropriate for the home's heating and cooling load. The contractor pulls both HVAC and electrical permits; the HVAC permit application includes the Manual J, equipment specs, duct layout, and asbestos abatement plan (required in SeaTac for any disturbance of pre-1980s materials). The city Building Department routes the application to plan review; a planner checks the ductwork routing (to ensure it does not penetrate into attic knee walls or create condensation issues), the electrical load (4-ton unit + 10-kW strip = ~50 amps plus existing loads), and the backup heat strategy. If the service panel is already at 150 amps with room for a dual-pole 50-amp breaker, the review takes 5–7 business days. If a panel upgrade is needed, the electrical plan must be resubmitted and reviewed again (add 1 week). Rough inspections occur twice: one for ductwork (before closing it up) and one for the refrigerant lines, electrical, and condensate drain. Final inspection verifies refrigerant charge, breaker sizing, test reports, and system operation. Total timeline: 4–6 weeks. HVAC permit fee: $250–$350 (based on ~$7,500 system valuation at 3–4% of job cost). Electrical permit fee: $150–$200. Total permit cost: $400–$550. Project cost: $7,500–$12,000 depending on ductwork complexity and any panel upgrade. The homeowner is eligible for the 30% federal IRA tax credit (~$2,250 on a $7,500 system) and Puget Sound Energy rebates ($1,500–$3,000 for ENERGY STAR Most Efficient heat pump with strip heat). Asbestos abatement adds ~$1,500–$3,000; contractors must be licensed for abatement in Washington.
Full permit required (Manual J, plan review) | Licensed HVAC + electrical contractor | HVAC permit $250–$350 | Electrical permit $150–$200 | Rough + final inspections (4–6 weeks) | 30% IRA credit (~$2,250) | PSE rebates $1,500–$3,000 | Asbestos abatement $1,500–$3,000 (if needed) | Total project $7,500–$15,000
Scenario C
Supplemental heat pump addition (no existing central heat), new condensate line, panel upgrade needed — SeaTac home with baseboard-only heating
A homeowner in south SeaTac has a 1,200 sq ft home with only electric baseboard heat and window AC units; electricity bills are high in winter. The plan is to install a single-zone 2.5-ton air-source heat pump (outdoor unit on the front sill, indoor wall-mounted head in the great room) to provide primary heating and cooling, with the baseboards kept as backup. Because this is a new addition (not replacing an existing system), a full permit with Manual J is required. The contractor performs a blower-door air-leakage test and Manual J load calc; SeaTac's 28°F winter design temp and the home's modest insulation (R-11 walls, R-15 attic) result in a winter heating load of ~22,000 Btu/h. The 2.5-ton unit (30,000 Btu/h) is slightly oversized for heating but appropriate for summer cooling (higher load due to solar gain and humidity). The HVAC plan must show the refrigerant lines (from outdoor unit, along the front wall, into the home), the condensate drain (sloped to a basement floor drain or exterior sump), and the control wiring. The electrical plan shows a new 30-amp breaker for the indoor air handler (fan coil motor) and a separate 30-amp breaker for the outdoor compressor; the existing 100-amp service panel has only one open position, so a panel upgrade to 150-amp is required (adds $3,000–$4,000 and 2 weeks to the timeline). The contractor also notes that because the baseboard heaters (240V, ~15 kW total) will remain energized, the home's total electrical load is already near capacity; the panel upgrade is non-negotiable. The Building Department issues the HVAC permit after plan review (7–10 business days); the electrical permit is held pending the panel-upgrade plan, which the electrician must submit separately. Once the electrician's plan is approved, the roughing inspection for electrical happens first (panel upgrade and breaker installation), then HVAC rough inspection (refrigerant lines and indoor coil placement), then final inspections in sequence. Total timeline: 6–8 weeks. HVAC permit fee: $200–$300. Electrical permits (main panel upgrade + heat pump circuits): $300–$400. Total permit cost: $500–$700. Project cost: $6,500 (heat pump) + $3,500 (panel upgrade) + $2,000 (condensate routing and misc.) = ~$12,000. The homeowner qualifies for the 30% IRA tax credit on the heat pump cost only (~$1,950 on the $6,500 system), not the electrical work. PSE rebates are $1,500–$2,000 for a 2.5-ton ENERGY STAR Most Efficient unit. After permit closeout, the home's heating bills should drop 30–50% (depending on setpoints and baseboard usage). Note: If the homeowner had attempted to install this without a permit, SeaTac's Building Department could assess a $500–$1,500 penalty upon discovery, and the homeowner would forfeit all rebates and the IRA tax credit ($3,450–$3,950 total loss).
Full permit required (new addition, Manual J, panel review) | Licensed HVAC + electrician required | HVAC permit $200–$300 | Electrical permits $300–$400 | Panel upgrade $3,000–$4,000 (separate estimate) | Rough + final inspections (6–8 weeks) | 30% IRA credit (~$1,950) | PSE rebates $1,500–$2,000 | Total project $12,000–$13,000

Every project is different.

Get your exact answer →
Takes 60 seconds · Personalized to your address

SeaTac's climate and heat pump sizing: why Manual J load calc matters in the Puget Sound region

SeaTac sits in IECC climate zone 4C (maritime), with design winter temps of 28°F and summer highs of 79°F. This differs significantly from eastern Washington (zone 5B, design winter 0°F, summer 92°F) and affects heat pump selection. A 3-ton unit sized for SeaTac's mild winters and high humidity will be oversized if moved to Spokane, and undersized if relocated to the Cascades' east slope. Manual J load calculations use local design temperatures, solar exposure, and the home's envelope (insulation, air leakage, window orientation). SeaTac's high outdoor humidity (annual average ~70%) also means the indoor coil will dehumidify more than in dry climates, consuming latent cooling capacity during mild-but-wet shoulder months. The Building Department requires Manual J for any new or upsized heat pump because an undersized unit will not reach setpoint in January, and an oversized unit cycles on and off inefficiently, wasting energy.

Another Puget Sound wrinkle: SeaTac's homes are often older (pre-1980), with air-leakage rates of 15–25 air changes per hour at 50 pascals. Modern homes target 7 air changes per hour or lower. A 1950s bungalow with R-11 walls, original single-pane windows, and a ventilating attic will have a much larger heating load per square foot than a 2020 home with R-19 walls, triple-pane windows, and a sealed attic. The Manual J must reflect these details. If the contractor estimates the load without a blower-door test or detailed construction audit, the calculated tonnage can be off by 20–30%, leading to undersizing or oversizing. SeaTac's Building Department reviews Manual J submissions and will reject undersized designs; the contractor must revise and resubmit, delaying the permit.

Backup heat (electric resistance strip) is also sized by the Manual J. If the heat pump's balance point (the outdoor temp at which it can no longer meet heating demand) is, say, 25°F, and SeaTac's design winter temp is 28°F, the strip heat may never be needed during the design cold snap. However, if the balance point is 35°F (common for older, less efficient units), the strip heat must be sized for the full heating load below that temp, which could be 15–20 kW. This requires a larger electrical panel or upgrade. The permit reviewer checks that the strip-heat breaker is properly sized and that the panel has capacity; without Manual J showing the balance point and strip-heat load, the electrical reviewer will flag the application as incomplete.

The permitting timeline expands if the Manual J reveals that panel capacity is inadequate. A panel upgrade typically takes 2–3 weeks to spec, permit separately, and inspect; if the HVAC permit is waiting for the electrical work, the total project stretches to 6–8 weeks. Homeowners expecting a 2-week turnaround on a conversion or new installation often discover that the envelope and electrical loads are the limiting factors, not the heat pump itself. Hiring a contractor who runs Manual J before quoting helps avoid surprises.

SeaTac permit portal workflow and fees: how to navigate the online application

The City of SeaTac Building Department operates an online permit portal (accessible via the city website) where contractors and property owners can apply for HVAC and electrical permits. The portal requires a login (free account) and uploads of PDF documents: equipment specifications (nameplate data from the heat pump and condenser), the Manual J load calculation (if applicable), a mechanical plan or sketch showing refrigerant line routing and condensate drain location, and an electrical single-line diagram or breaker list showing the heat pump's circuit and overcurrent protection. For a simple replacement, these uploads can be as minimal as a photo of the existing unit nameplate and a note stating 'like-for-like replacement.' For a new install or conversion, a full mechanical and electrical plan is expected; hand-drawn sketches are often rejected, and contractors typically use CAD or simple software tools (Revit, SketchUp with annotations) to generate plans.

SeaTac's permit fees are based on project valuation (the total cost of materials and labor). The fee schedule is roughly 2–4% of valuation for HVAC permits, with a minimum of $75 and a cap of $300–$400 for residential systems. An electrical permit for the heat pump circuit is separate, typically $100–$200. The city accepts credit cards, checks, and ACH transfers online; fees are due when the application is submitted (not at inspection or closeout). For a $7,500 heat pump installation, expect roughly $250–$300 in HVAC permit fees and $150–$200 in electrical permit fees, for a total of $400–$500. If a service panel upgrade is required, a separate electrical permit is issued for the panel work, adding another $200–$300 to the fee.

Once the application is submitted, the city issues a permit number within 1–2 business days. If the application is incomplete (missing Manual J, insufficient plan detail, or conflicting information), the Building Department sends a 'Disapproved Pending Information' notice via email, listing the deficiencies. The contractor then uploads revised documents; the re-review typically takes 3–5 business days. SeaTac's online system tracks the application status in real-time, so homeowners can log in and see whether the permit is issued, pending review, or awaiting information. Unlike some jurisdictions (e.g., Tacoma) that require in-person plan review appointments, SeaTac's system is entirely online; this speeds up the process significantly for straightforward applications.

Inspection scheduling is also managed through the portal. Once the permit is issued, the contractor (or homeowner, if DIY electrical work is involved, though it isn't for heat pumps) logs in and books inspection dates. SeaTac's Building Department typically offers inspection slots within 2–3 business days of request; inspectors arrive within a 2-hour window. Most heat pump projects require 2 inspections: rough (before drywall is closed up, for ductwork or refrigerant line runs) and final (after equipment is energized and charged). If electrical work is involved, an electrical inspector conducts a separate rough inspection of the panel and breaker, then coordinates with the mechanical inspector for final testing. The permit portal shows all inspection dates and pass/fail status.

City of SeaTac Building Department
SeaTac City Hall, SeaTac, WA (contact via city website for exact address and mailing details)
Phone: (206) 973-4700 (main city line; ask for Building Department) | https://www.seatacwa.gov (building permits section in online services)
Monday–Friday, 8:00 AM–5:00 PM (verify via city website for holiday closures)

Common questions

Can I install a heat pump myself in SeaTac, or do I have to hire a licensed contractor?

Washington State law (RCW 19.28) requires a licensed HVAC contractor for all heat pump work, including replacements and conversions. Owner-builder exemptions do not apply to mechanical systems in SeaTac. You can hire a contractor to do the installation, but you cannot legally do it yourself. Electrical work (breaker installation, wiring) must also be done by a licensed electrician or a homeowner with an owner-builder permit, but in practice, most contractors pull both permits together to avoid liability.

How long does it take to get a heat pump permit approved in SeaTac?

Like-for-like replacements pulled by a licensed contractor typically receive over-the-counter approval within 1 business day and carry no fee (or a nominal $25 fee). New installations or conversions require plan review and usually take 5–10 business days if the application is complete. If Manual J load calc, electrical panel review, or design revisions are needed, the timeline can stretch to 3–4 weeks. Most projects can be started within 2–3 weeks of permit issuance if inspections are scheduled promptly.

What if my electrical panel doesn't have a spare breaker for the heat pump?

If your service panel is full, you will need a panel upgrade before the heat pump can be installed. A panel upgrade from 100 amps to 150 amps typically costs $3,000–$4,000 and adds 2–3 weeks to the project (it requires a separate electrical permit and inspection). This is a common issue in older SeaTac homes with original 100-amp panels. The electrical contractor should assess panel capacity during their initial quote and budget accordingly.

Do I qualify for the federal IRA tax credit and utility rebates for my heat pump?

Yes, if your installation is permitted and inspected. The 30% federal IRA tax credit (up to $2,000) applies to owner-occupied homes and is claimed on your tax return the year the equipment is installed. Puget Sound Energy and other local utilities offer rebates of $1,500–$5,000 for ENERGY STAR Most Efficient heat pumps; rebates require proof of a closed permit and final inspection. Unpermitted installations disqualify you from all rebates and the IRA credit, costing $3,500–$7,000 in lost incentives.

What happens during a heat pump installation inspection in SeaTac?

For HVAC work: the rough inspection checks refrigerant line insulation, slope, and protection from damage; condensate drain routing; and proper clearance around the indoor coil (per IRC M1305). The final inspection verifies refrigerant charge (typically measured with gauges and logged), system operation (heating and cooling cycles), breaker operation, and conduit/wiring integrity. The inspector may also verify the Manual J load calc matches the installed tonnage. For electrical: the inspector checks breaker sizing, wire gauge, grounding, and disconnection switch placement. If a duct system was replaced, there may be a duct-tightness test or visual inspection of sealing. Most inspections take 30–60 minutes on-site.

Are there any SeaTac-specific rules about where I can place the outdoor heat pump unit?

No SeaTac-specific zoning restrictions on outdoor unit placement that differ from state code, but the unit must comply with IRC M1305 clearance rules (e.g., 5 feet from property lines, 3 feet from windows or doors) and must not obstruct emergency egress or sidewalk access. If your home is in a historic district (e.g., SeaTac has some historic overlays near the downtown core), the Planning Department may review aesthetic impacts of the outdoor unit. Check with the city's Planning Division if your property is in a historic district or overlay zone.

Can I use a heat pump with no backup heat, or do I need electric resistance strip heat?

Heat pumps naturally include an auxiliary electric resistance heating element that activates below the balance point (typically 15–35°F). In SeaTac's mild winters, this backup may rarely be needed, but it is required by the manufacturer and by Washington State energy code (IECC) to ensure the home can reach setpoint during cold snaps. You cannot disable or omit the strip heat. The electrical permit must show the strip-heat breaker and load; if your panel does not have space, a panel upgrade is required.

If I already have a heat pump from 2010 and it still works, can I avoid permitting if I just hire a contractor to service it?

Routine service (charging, cleaning, filter replacement) does not require a permit. However, if the refrigerant line is relocated, the compressor is replaced, the indoor coil is swapped out, or the outdoor unit is moved, a full replacement permit is typically required in SeaTac. The safest approach is to ask your contractor in writing whether the planned work triggers permitting; if there is any doubt, pull a permit (inexpensive insurance vs. a $500–$1,500 fine and a stop-work order later).

What is the difference between a heat pump and a mini-split system, and does SeaTac treat them differently for permits?

A heat pump is the equipment category; a mini-split (ductless) and a ducted split system are both types of air-source heat pumps. Mini-splits (single-zone or multi-zone wall-mounted heads, outdoor unit) and ducted systems (central air handler, ductwork, outdoor compressor) both require permits in SeaTac if they are new installations or replacements. There is no exemption for mini-splits. Permitting and inspection requirements are the same: Manual J load calc, electrical review, and rough + final inspections. The advantage of a mini-split is lower installation cost (no ductwork) and faster install time (2–3 days vs. 5–7 days for a new duct system), but the permitting timeline is identical.

Can I claim a heat pump rebate if I installed it before getting a permit, but then apply for the permit retroactively?

No. Utility rebate programs and the federal IRA tax credit require a open, active permit at the time of installation and a signed-off permit (final inspection passed) before rebate claim processing. If you install a heat pump without a permit first, the utility and IRS will deny the rebate and credit when they audit your permit record. SeaTac's Building Department will not backdate a permit to cover unpermitted work; they will treat it as a violation. Always pull the permit before work begins.

Nearby cities & related guides

Heat Pump Installation Permits in Seattle, WA Heat Pump Installation Permits in Spokane, WA Heat Pump Installation Permits in Tacoma, WA
Disclaimer: This guide is based on research conducted in May 2026 using publicly available sources. Always verify current heat pump installation permit requirements with the City of SeaTac Building Department before starting your project.

Keep researching

Heat Pump Installation permits in other Washington cities
Other permits in SeaTac
Heat Pump Installation permits in popular cities
  • New York, NY
  • Los Angeles, CA
  • Chicago, IL
  • Houston, TX
  • Phoenix, AZ
  • Philadelphia, PA
  • San Antonio, TX
  • San Diego, CA
Browse all